showing the histogram in UIAxes_2 And not separately in the application

my code:

 global a;
            global input;
            input=im2gray(a);
            imhist(input);
            imshow(input,'Parent',app.UIAxes_2);

Answer 1

[Walter Roberson]

imhist() does not have any possibility of passing in an an axes.

You will need to use the form of imhist() with outputs, and then draw the results. Something like

a = app.a;
app.gray_a = im2gray(a);
[counts, locations] = imhist(app.gray_a);
imshow(app.gray_a, 'Parent', app.UIAxes_2);
hold(app.UIAxes_2, 'on');
bar(locations, counts, 'Parent', app.UIAxes_2);
hold(app.UIAxes_2, 'off');

Notice the lack of global variables. Using global variables in App Designer is most often... misguided...